Filosofskoe i nauchnoe znachenie idei N.I. Lobachevskogo
Litsis, Nikolai Andreevich.
Riga Zinatne
1976
At head of title: Akademiia nauk Latviiskoi SSR Otdelenie obshchestvennykh nauk
Includes bibliographies and index
Lobachevskii, Nikolai Ivanovich